Turret-operating mechanism.



No. 632,906. Patented Sept. I2, I899. A. SWASEY.

TURBET OPERATING MECHANISM.

(Application filed Mar. 31, 1899.)

(No Model.) 2 Sheets-Sheet l.

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No. 992,906, Patented Sept. l2, I899.

A. SWASEY.

TUBRET OPERATING MECHANISM.

I (Application filed Mar. 31, 1899.) No Model.) 2 Sheets-Sheet 2.

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SWASEY, OF

SAME PLACE.

TU RRET-OPERATING MECHANISM.

SPECIFICATION forming part of Letters Eatent No, 632,906, dated September 12, 1899.

Application filed March 31,1899.

holding it firmly after it has been indexed and while each of the tools it is designed to carry is acting upon the stock.

One object of the invention is to provide as the means for turning the turret to bring the various tools into working position simple mechanism which will impart to the turret a motion which is analogous to a pendulous motion in this, that the turret is slowly started and its speed is gradually increased until half its movement is completed, and then its speed gradually decreases until 'it comes to rest.

Another object is to provide simple mechanisms for indexing theturret and for holding it'firmly after it has been indexed, all of which will be hereinafter described, and pointed out definitely in the claims.

In the drawings, Figure 1 is a vertical sectional view in the plane indicated by line 1 1 of Fig. 2. Fig. 2 is a bottom view of the turret. Fig. 3 is a vertical sectional view of the turret-slide in the plane indicated by line i 3 3 of Fig. 1. Fig. 4 is a vertical sectional view of the turret-slide in the plane indicated by line 4: 4 of Fig. 2, and Fig. 5 is a vertical sectional view of the turret-slide in the plane indicated by line 5 5 of Fig. 2.

Referring to the parts by letters, A represents the bed of the lathe, and 13 represents the turret-slide, which is mounted upon the Serial No. 711,252. (No inodel.)

ret D is supported and may be turned. stud F, which is fast to the slide B, is centrally placed with reference to this recess, and it extends vertically through a tapered hole in the base-plate. A tapered sleeve II embraces the stud F, to which it is keyed, and fits the tapered hole in the base-plate, whereby the turret is accurately centered. This sleeve has a head h, which overhangs the base-plate and holds it down on the bed of the recess 1). A screw f, which screws into the stud F, engages with the top of this sleeve and holds it down. The turret turns upon the sleeve H, as well as in the recess Z), and is guided by both instrumentalities.

In the under surface of the base-plate, cut into the integral metal thereof, or in a subbase secured thereto are as many radial grooves d as there are sides to the turret or places for attaching tools. These grooves are connected at their inner ends by the grooves (1 These grooves 61 are'of peculiar shape, as shown-that is to say, their outer walls are arc-shaped and are concentric with the turret, while their inner walls are reversely curved upon a radius equal to the distance from the axis of the crank-shaft G to the inner face of the crank-arm g. These connecting-grooves 61 must bewide enough to permit the passage of the crank-pin g from one of the radial grooves 61' to the next one. The mechanism for turning the turret would be operative if these connecting-grooves were not shaped as specifically described, provided they were so shaped that the crank-pin g could pass through them from one radial groove to the next one; but the peculiar shape of these grooves, as described, gives them certain specific and practically valuable functions, as will be understood from the subsequent description.

In the top surface of the slide 13 there is a cylindrical recess b,in which a crank-arm g operates. This crankarm is attachedto the top-of a crank-shaft G, whose lower end: finds its bearing in a cylindrical hole in the slide B. A bearing for the upper end of this crankshaft, just beneath the crank-arm g, is furnished by a plate J, which is secured to the slide B. Below the plate J a spiral gear 9 is l secured to this crank-shaft. A crank-pin g is fastened to the crank-arm g, and on this pin is a friction-roller g which projects into the described grooves in the under face of the base-plate of the turret.

An operating-shaft E is journaled in the slide B. A spiral gear 6 is secured to it, and this gear engages with the spiral gear g on the crank-shaft G. By turning this shaft E the crank-shaft G is caused to rotate, and the crank-pin g thereon moves in the path indicated by dotted lines in Fig. 2. It enters one of the radial grooves d and by engaging with the walls thereof slowly starts the turret and moves it with increasing speed until the crank has made half its revolution and then with decreasing speed until the turret comes to -rest as the crank-pin moves out of said radial groove and into the connecting-groove (Z Vhen the crank-shaft comes to rest, the outer arc-shaped end of the crank-arm is in engagement with the arc-shaped inner wall of the connecting-groove (1 (see Fig. 2,) whereby the turret is practically locked in the proper position. Reliance, however, is not placed upon this locking device for accurately holding the turret in working position.

An indexing device is provided which consists of a vertically-movable pin N, having a tapered upper end it, and which is vertically movable in a hole in the slide B. The upper tapered end of this pin is adapted to enter one of the tapered holes 61 in the turret, of which there are as many as there are radial grooves d. This pin is moved up and down by means of a lever P, pivoted to the slide B andhaving its curved front end projected into a transverse slot n in the indexing-pin. A spring t presses a vertically-movable pin T down onto the tail of the lever, and thus the normal position of the indexing pin is, through the action of the mechanism described, in engagement with the turret, as shown in Fig. 1. On the shaft E, however, there is a cam e, which is adapted to engage with the lever P and does engage therewith and cause the withdrawal of the indexing-pin before the turret begins its movement.

A clamp is provided for holding the turret fast to the slide B after it has been indexed. This clamp is a laterally-projecting finger r on the upper end of a pin R, which is vertically movable in the slide 13. This finger enters an undercut groove (1 in the outer walls of the groove (Z This pin is drawn downward after the turret is indexed by suitable mechanism operated by the shaft E. In the preferred form of the mechanism for so moving this pin R the lower end of this pin has a nut 4" screwed upon it, and between this nut and the lower face of the slide 13 a loose collar 7' is placed, embracing the pin. This collar has an arm 0", and the arm carries a finger r which enters a cam-groove a in a sleeve U, secured to the shaft E. This collar 0 has uponits upper face inclined surfaces 0", which engage with corresponding inclined surfaces b on a block b", secured to the under surface of the slide 13. enters a hole in the bottom of this clampingpin, is compressed between the end of that hole and a bracket Z)", which is secured to the slide B. The spring therefore exerts a continuous pressure to move the pin R upward to cause the finger r to loosen its hold upon the turret; but whe the turret has reached an operating position and has been indexed the cam-groove it, acting through the described mechanism, causes the collar r to be turned, and the resulting engagement of the inclined surfaces 0' b draws this clamping-pin downward, whereby its finger r firmly clamps the turret to the slide B.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a turret-lathe, the combination of a turret-slide and a turret rotatably mounted thereon and having on its lower surface a plurality of radial grooves, and other grooves connecting the inner ends thereof, with a crank-shaft mounted in the turret-slide parallel to the axis of the turret, a crank-arm secured thereto, a crank-pin projecting from said crank-arm into the grooves in the turret, and means for turning said crank-shaft, substantially as specified.

2. In a turret-lathe, the combination of a turret-slide, and a turret rotatably mounted thereon and having in its under face a plurality of radial grooves, and other grooves connecting the inner ends of said radial grooves, the inner walls of said connectinggrooves being arc-shaped upon a radius equal to the distance from the axis of the crankshaft to the outer face of the crank-arm carried thereby, with a crank-shaft mounted in the slide parallel to the axis of the turret, a crank-arm secured thereto, and a crank-pin secured to said arm and projecting into the grooves in the turret, and means for rotating said crank-shaft, substantially as specified.

3. In a turret-lathe, the combination of a turret-slide and a turret rotatably mounted thereon and having on its lower surface a plurality of radial grooves, and other grooves connecting the inner ends thereof, with a crank-shaft mounted in the turret-slide parallel to the axis of the turret, a crank-arm secured thereto, a crank-pin projecting from said crank-arm into the grooves in the turret, ahorizontal shaft mounted in the turret-slide, and meshing gears secured to said shaft and to the crank-shaft, substantially as specified.

a. In a turret-lathe, the combination of the turret-slide, a turret rotatably mounted thereon having index-holes in its under side and turret-turning mechanism with a rotatable shaft mounted in the slide and extending transversely of its path of movement, mechanism intermediate of the shaft and turretturning mechanism whereby the latter is operated,a vertically-movable index-pin, a lever pivoted to the slide and engaging with said pin, a spring for moving the pin upward, and

A coiled spring r which 7 a cam on said shaft for engaging with the lever whereby the pin is moved downward, substantially as specified.

5. In a turret-lathe, the combination of a turretslide, and a turret rotatably mounted thereon and having in its lower face an undercut groove concentric with its axis, with a vertically-movable clamping-pin, havinga finger which enters the undercut part of said groove, a shaft mounted in the turret-slide, and mechanism operated by said shaft to draw the clamping pin downward, substantially as specified.

6. In a turret-lathe, the combination of a turret-slide, aturret rotatably mounted there' on and having in its lower face an undercut groove concentric with its axis, with a verti- (sally-movable clamping-pin, having a finger which enters the undercut part of said groove, a spring which acts to move said pin upward, a nut on the lower end of said pin, a collar loosely embracing the pin, an inclined sur- 

